Adjustable Center Crossheads Operations Manual

Size: px

Start display at page:

Download "Adjustable Center Crossheads Operations Manual"

Audrey Brooks
6 years ago
Views:

Plastic Extrusion Tooling Specialists ph: 800.272.

Thank you for purchasing a B&H Tool Company product.

B&H Tool Company has been providing reliable service and producing quality products for several years.

1 Plastic Extrusion Tooling Specialists ph: Adjustable Center Crossheads Operations Manual BH25, BH30, BH75, BH225, BH250 & BH750 B&H TOOL COMPANY FIRST IN EXTRUSION TOOLING Dear Customer, Thank you for purchasing a B&H Tool Company product. Founded in 1967, B&H Tool Company was the first company to specialize in the manufacture of crossheads. B&H Tool Company has been providing reliable service and producing quality products for several years. We are sure that you will agree with our other customers that this equipment is reliable and easy to use. The following is an explanation of the operation of our crossheads to help you with set-up and cleaning. If you have any questions do not hesitate to call us at We would be glad to assist you. Sincerely, Peter Neville, President 285 Pawnee Street San Marcos, CA ph: fax:

SET-UP: Assembly Reference Crosshead Drawings Provided 1.

your set-up with the crosshead on your extruder, or at a set-up area.

hands. 2. Screw the tip into the core tube.

Tighten tip with a crescent or hex wrench gently.

NOTE: If changing out a tip extend core tube as far as possible by turning

Remove tip and clean exposed surface of core tube. Install new tip.

Loosen the four (4) die adjusting set screws and slide die into die holder

In this case, put die into die cup and slide die cup into die holder. 4.

2 SET-UP: Assembly Reference Crosshead Drawings Provided 1. Remove the four (4) die holder cap screws and die holder You can perform your set-up with the crosshead on your extruder, or at a set-up area. If you are assembling hot parts, be sure to use gloves to protect your hands. 2. Screw the tip into the core tube. Some tips have flats on OD and some tips have a hex in the end. Tighten tip with a crescent or hex wrench gently. Do not over tighten the tip. NOTE: If changing out a tip extend core tube as far as possible by turning adjusting nut counterclockwise. Remove tip and clean exposed surface of core tube. Install new tip. 3 A & B. Loosen the four (4) die adjusting set screws and slide die into die holder 3 C. Note: Some crossheads have a die cup/die assembly. In this case, put die into die cup and slide die cup into die holder. 4. Assemble Die Holder by installing the four (4) Die holder caps screws. Tighten cap screws so that they are snug. It is not necessary to overtighten the screws in order to seal the crosshead. The wedge ring prevents the crosshead from leaking by sealing against the die. 5. Tighten the four (4) die adjusting set screws, centering die by appearance.

OPERATIONS: Tip & Die Adjustment Pressure Tooling 1 A, B & C.

by loosening the jam nut and rotating the core tube at the back of the crosshead.

tightening the jam nut. Once the tip is in the correct rotational position, tighten the jam nut.

Adjust the axial position of the tip by loosening or tightening the adjusting nut at the back of the crosshead.

If you have pressure tooling manufactured by B&H Tool Company, the face of the tip should be one product diameter back

If necessary, the axial position of the tip may be adjusted by turning the adjusting nut while you are extruding product.

To establish the position of the tip relative to the die, remove the die from the die holder and place it against the

Use a depth gauge and measure the distance from the back end of the core tube to the crosshead.

3 OPERATIONS: Tip & Die Adjustment Pressure Tooling 1 A, B & C. Once the pressure tip and die are assembled in the crosshead, you can rotate the tip, making a parallel construction wire by loosening the jam nut and rotating the core tube at the back of the crosshead. There are flats machined into the core tube, so you can hold onto the core tube with a wrench while loosening or tightening the jam nut. Once the tip is in the correct rotational position, tighten the jam nut. Note: This step is not necessary for simple construction, round products. 2. Adjust the axial position of the tip by loosening or tightening the adjusting nut at the back of the crosshead. Rotating the adjusting nut clockwise moves the tip back in the crosshead. If you have pressure tooling manufactured by B&H Tool Company, the face of the tip should be one product diameter back from the land of the die, as an initial starting position. If necessary, the axial position of the tip may be adjusted by turning the adjusting nut while you are extruding product. 3 A & B. To establish the position of the tip relative to the die, remove the die from the die holder and place it against the wedge ring. Extend the tip forward by rotating the adjusting nut until the tip contacts the inside of the die. Use a depth gauge and measure the distance from the back end of the core tube to the crosshead. Back off the core tube, measuring the distance from the end of the core tube to the crosshead, to establish the desired gap between your tip and die. 4. The die or product center can be fine-tuned by tightening and/or loosening the four (4) die adjusting set screws while extruding product. Tighten and loosen opposite screws by equal amounts. Sleeving or Tubing Tooling 1. The adjustment of sleeving or tubing tooling is the same as pressure tooling except that for B&H tooling the end of the tip land should line up flush with the face of the die as an initial starting position.

CLEANING: Breakdown Reference Crosshead Drawings Provided

Loosen the four (4) die adjusting set screws 1 Crosshead

still hot. Use gloves to protect hands. 2.

You may need to use a wooden dowel or brass bar to pry

Press out die from die holder or die cup.

Extend core tube as far as possible by turning the

Core tube can be completely removed by detaching jam nut

4 CLEANING: Breakdown Reference Crosshead Drawings Provided Die Holder, Die and Tip 1. Loosen the four (4) die adjusting set screws 1 Crosshead should be cleaned immediately after purging all compound from extruder. We recommend that the crosshead be disassembled while still hot. Use gloves to protect hands. 2. Remove the four (4) die holder cap screws and die holder. You may need to use a wooden dowel or brass bar to pry die holder from barrel body. 2A 3. Press out die from die holder or die cup. Clean die holder or die cup with copper mesh. 2B 4. Extend core tube as far as possible by turning the adjusting nut counterclockwise. 3A 5. Core tube can be completely removed by detaching jam nut and pushing core tube forward through crosshead. Do not pull the core tube assembly out the back end of the crosshead or material will collect on the inside of the deflector. 6. Remove tip and clean with copper mesh 3B 4 5 6

Remove the adjusting nut holder, adjusting nut and adjusting tube.

If deflector is difficult to remove, replace two (2) short cap screws

Clean the deflector while it is still hot using copper or brass brush

Use B&H wedge ring removal tool or wooden dowel to tap out wedge ring

Clean wedge ring while still hot using copper or brass brush copper mesh.

5 CLEANING: Breakdown 8 A. Remove all six (6) cap screws from rear of crosshead 8 B & C. Remove the adjusting nut holder, adjusting nut and adjusting tube. Set these aside for cleaning. 9 A & B. Remove deflector. If deflector is difficult to remove, replace two (2) short cap screws with two (2) long cap screws and tighten in order to jack deflector out of barrel body. Tighten two cap screws equally so that deflector comes out straight. Clean the deflector while it is still hot using copper or brass brush and copper mesh. 10. Use B&H wedge ring removal tool or wooden dowel to tap out wedge ring from barrel body. Clean wedge ring while still hot using copper or brass brush copper mesh. 11. After completely cleaning the crosshead, coat the crosshead parts and all threads prior to assembling with Teflon lube provided by B&H Tool Company, or another mold release. Anti-seize containing copper or aluminum should be avoided. 285 Pawnee Street San Marcos, CA ph: fax:

AR15 SUPER SLIM AND ULTRA SLIM FREE FLOAT RAIL SYSTEMS

MUM066011803 AR15 SUPER SLIM AND ULTRA SLIM FREE FLOAT RAIL SYSTEMS Proudly Designed and Made in USA Super Lightweight, Flush Fitting, and Continuous with Flat Top AR15 Upper Receiver Features Integral